JBL 400gti

[Patrick Bateman]

I've noticed a lot of interest on this board in small woofers. I've recently measured a few for a project that I'm doing. Here are the *actual measured specs* on the driver. You can rarely trust the published specs, so these may come in handy.

Driver Name: JBL 400GTI
FS: 186.7hz
QMS: 7.8
QES: 0.85
QTS: 0.76
RE: 3.2
VAS: I was too lazy to measure VAS. JBL says it's 1.1 liters, and that seems accurate.

The 400gti is a funky driver, with a 4" cone and a neodymium motor. It has a ridiculous Dynaudio-sized voice coil, and it's power handling is absurd. It hasn't been made in 4 years or so, but you'll see them on Ebay occasionally.

If I'm not mistaken, it is the only 4" driver with a neo motor besides the AuraSound NS4. It offers higher efficiency and higher power handling.

It has a couple of downsides; the carbon fiber cone breaks up surprisingly early, and it has a high inductance due to the huuuuuuge voice coil.

[300Z]

Cool, that's the driver that I am currently using...

I'm using it from 80hz 24db/oct up to ~1.5khz 12db/oct. And so far I think this is quite possible the setup I have been happiest... I like this mid better than the Dayton RS180-8 that it replaced.

Leo

[Patrick Bateman]

Originally Posted by 300Z

Cool, that's the driver that I am currently using...

I'm using it from 80hz 24db/oct up to ~1.5khz 12db/oct. And so far I think this is quite possible the setup I have been happiest... I like this mid better than the Dayton RS180-8 that it replaced.

Leo

It doesn't really have any competition. The Auras can't handle as much power, and they're not as efficient. You need to cross it over low though, as the peak in the upper midrange is nasty.

[300Z]

Yes, the peak in the midrange area is bad; But in my car they are working quite well with those crossover points. But I need to play with it some more and get it dialed in some more.

But this is just something that I just threw together in a very short amount of time just to have some tunes... "pretty impressive" was the words I heard at our last GTG around here.
I'm quite happy with them right now and most likely it seems they will be the mids I will settle with. Finally...

Cheers

Leo

[NaamanF]

The Scan 4" Revelators uses a neo mag. Different price range though.